Abstract
A new concept, defined as spectral-gate injection seeding, is proposed for coupling the master oscillator (MO) and the forced oscillator (FO) in tunable injection-seeding laser systems. It is based on the use of a spectral selector as a tunable narrowband spectral gate between the partially coupled MO and FO cavities. The concept proposed enables one to implement compact and efficient injection-seeded tunable lasers. It is demonstrated experimentally on Nd:YAG-laser pumped dye lasers with a Fizeau interferometer as a spectral gate. Full suppression of the FO’s broadband spectral background is acheived even when the MO operates near the threshold.
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